A system monitors and controls the injection of additives into formation fluids recovered through a well may include a plurality of nozzles that receive the injection fluid from an umbilical disposed in a well. It includes a p low concentration layer formed between the n buffer layer and a p drain layer. A sound level threshold detector determines whether a sound pressure level of the sound signal is at a minimum level and outputs a sound pressure level signal corresponding to the sound pressure level when the sound pressure level is not at the minimum level. The measurement system generates a repeating signal having a measurement cycle that corresponds to the capacitance of the capacitor.